HackingHealthcareTechnologyHealthcareData ExfiltratedSupply Chain (3P Vendor)Business Associate (HIPAA)Customer Data InvolvedDelayed DiscoveryPHIIdentity (basic)Government IDHealth (basic)Financial accountMediumContained

Shenandoah Valley Medical System, Inc.

bd_3b97726fa4a0fefa · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jul 7, 2026

Filed

Aug 11, 2026

To disclose

5 weeks

Affected

23state residents only

Linked

3 filings

Confidence

65%

Full breach record for Shenandoah Valley Medical System, Inc. →2 incidents on file

Aesto LLC d/b/a Aesto Health, a healthcare data migration and archiving service provider, experienced a network security incident impacting its AWS infrastructure. An unauthorized actor accessed and copied data between December 2 and December 18, 2025. Aesto detected the incident on December 18, 2025, and confirmed the scope on May 26, 2026. Affected data included PHI, names, SSNs, and financial account numbers for patients of Covered Entity clients, including Shenandoah Valley Medical System. Approximately 23 New Hampshire residents were notified via mail starting August 11, 2026. Aesto engaged forensic specialists, contained the incident, and offered credit monitoring.

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Incident timeline

undetected · 217 days

discovery → filing · 5 weeks / 35 days

Dec 2, 2025

Begins

Jul 7, 2026

Discovered

Aug 11, 2026

Filed

vs. sector median

4 wks faster

This filing is one of 3 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Massachusetts State AGbd_3114079c68dac48a2026-08-11Candidate
Vermont State AGbd_f3564c6e4326f4522026-08-11Verified

Name: Shenandoah Valley Medical System, Inc.
norm: shenandoah valley medical system

Name: Shenandoah Valley Medical System, Inc.
norm: shenandoah valley medical system
Industry: HealthcarellmTechnologyllm

Discovered: Jul 7, 2026
Breach occurred: Dec 2, 2025 – Dec 18, 2025
Undetected for: 217 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 11, 2026
Affected individuals: 23state-resident count only
Data types: PHIIdentity (basic)Government IDHealth (basic)Financial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Notified New Hampshire Attorney General
Third party: via Aesto LLC d/b/a Aesto Health

During the incident: Commenced an investigation into the full nature and scope of the incident
Worked closely with third-party forensic specialists
Contained the incident
Engaged leading cybersecurity experts
Notified Covered Entity clients
Posted notice of this event on its website
Provided notice to major statewide media
Began mailing notice letters to affected New Hampshire residents
Provided access to Single Bureau Credit Monitoring/Identity Protection services at no charge
Changes made: Continually evaluates and modifies practices and internal controls to enhance security and privacy
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(35 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Massachusetts State AGAug 11 · first

Vermont State AGAug 11 · first

New Hampshire State AGAug 11 · first · this page

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://mm.nh.gov/files/uploads/doj/remote-docs/shenandoah-valley-medical-system-20260811.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 11, 2026
Raw hash: 50889ffdb7784bfbaa9804fe83729129d246aea1131903a04dd149337b04b47c

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityShenandoah Valley Medical System, Inc.

Victim entityShenandoah Valley Medical System, Inc.

Incidentdiscovered Jul 7, 2026

Stated responseCommenced an investigation into the full nature and scope of the incident

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov